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me•dul•la

Pronunciation: (mu-dul'u),[key]—n.,—pl.-dul•las, -dul•laePronunciation: (-dul'ē).[key]1. Anat.a. the marrow of the bones.
b. the soft, marrowlike center of an organ, as the kidney or adrenal gland.
c. See medulla oblongata.2. Bot.the pith of plants.